Limit excerpt and change read more text

excerpt

functions.php 

function get_excerpt($count){
  $permalink = get_permalink($post->ID);
  $excerpt = get_the_content();
  $excerpt = strip_tags($excerpt);
  $excerpt = substr($excerpt, 0, $count);
  $excerpt = substr($excerpt, 0, strripos($excerpt, " "));
 $excerpt = '<p>'.$excerpt.'... </br><a  href="'.$permalink.'">Read more more</a></p>';
  return $excerpt;
}

template.php
 <?php echo get_excerpt(325); ?>